/*
 * @Author: your name
 * @Date: 2021-02-16 19:49:08
 * @LastEditTime: 2021-02-16 19:52:27
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: \demo_2021021601\include\common\my_string.c
 */
#include "ctype.h"
#include "my_string.h"

#ifndef __HAVE_ARCH_MY_STRNICMP
/**
 * my_strnicmp - Case insensitive, length-limited string comparison
 * @s1: One string
 * @s2: The other string
 * @len: the maximum number of characters to compare
 */
int my_strnicmp(const char *s1, const char *s2, size_t len)
{
  /* Yes, Virginia, it had better be unsigned */
  unsigned char c1, c2;

  c1 = 0;
  c2 = 0;
  if (len)
  {
    do
    {
      c1 = *s1;
      c2 = *s2;
      s1++;
      s2++;
      if (!c1)
        break;
      if (!c2)
        break;
      if (c1 == c2)
        continue;
      c1 = tolower(c1);
      c2 = tolower(c2);
      if (c1 != c2)
        break;
    } while (--len);
  }
  return (int)c1 - (int)c2;
}
#endif

char *___my_strtok;

#ifndef __HAVE_ARCH_MY_STRCPY
/**
 * my_strcpy - Copy a %NUL terminated string
 * @dest: Where to copy the string to
 * @src: Where to copy the string from
 */
char *my_strcpy(char *dest, const char *src)
{
  char *tmp = dest;

  while ((*dest++ = *src++) != '\0')
    /* nothing */;
  return tmp;
}
#endif

#ifndef __HAVE_ARCH_MY_STRNCPY
/**
 * my_strncpy - Copy a length-limited, %NUL-terminated string
 * @dest: Where to copy the string to
 * @src: Where to copy the string from
 * @count: The maximum number of bytes to copy
 *
 * Note that unlike userspace my_strncpy, this does not %NUL-pad the buffer.
 * However, the result is not %NUL-terminated if the source exceeds
 * @count bytes.
 */
char *my_strncpy(char *dest, const char *src, size_t count)
{
  char *tmp = dest;

  while (count-- && (*dest++ = *src++) != '\0')
    /* nothing */;

  return tmp;
}
#endif

#ifndef __HAVE_ARCH_MY_STRCAT
/**
 * my_strcat - Append one %NUL-terminated string to another
 * @dest: The string to be appended to
 * @src: The string to append to it
 */
char *my_strcat(char *dest, const char *src)
{
  char *tmp = dest;

  while (*dest)
    dest++;
  while ((*dest++ = *src++) != '\0')
    ;

  return tmp;
}
#endif

#ifndef __HAVE_ARCH_MY_STRNCAT
/**
 * my_strncat - Append a length-limited, %NUL-terminated string to another
 * @dest: The string to be appended to
 * @src: The string to append to it
 * @count: The maximum numbers of bytes to copy
 *
 * Note that in contrast to my_strncpy, my_strncat ensures the result is
 * terminated.
 */
char *my_strncat(char *dest, const char *src, size_t count)
{
  char *tmp = dest;

  if (count)
  {
    while (*dest)
      dest++;
    while ((*dest++ = *src++))
    {
      if (--count == 0)
      {
        *dest = '\0';
        break;
      }
    }
  }

  return tmp;
}
#endif

#ifndef __HAVE_ARCH_MY_STRCMP
/**
 * my_strcmp - Compare two strings
 * @cs: One string
 * @ct: Another string
 */
int my_strcmp(const char *cs, const char *ct)
{
  register signed char __res;

  while (1)
  {
    if ((__res = *cs - *ct++) != 0 || !*cs++)
      break;
  }

  return __res;
}
#endif

#ifndef __HAVE_ARCH_MY_STRNCMP
/**
 * my_strncmp - Compare two length-limited strings
 * @cs: One string
 * @ct: Another string
 * @count: The maximum number of bytes to compare
 */
int my_strncmp(const char *cs, const char *ct, size_t count)
{
  register signed char __res = 0;

  while (count)
  {
    if ((__res = *cs - *ct++) != 0 || !*cs++)
      break;
    count--;
  }

  return __res;
}
#endif

#ifndef __HAVE_ARCH_MY_STRCHR
/**
 * my_strchr - Find the first occurrence of a character in a string
 * @s: The string to be searched
 * @c: The character to search for
 */
char *my_strchr(const char *s, int c)
{
  for (; *s != (char)c; ++s)
    if (*s == '\0')
      return NULL;
  return (char *)s;
}
#endif

#ifndef __HAVE_ARCH_MY_STRRCHR
/**
 * my_strrchr - Find the last occurrence of a character in a string
 * @s: The string to be searched
 * @c: The character to search for
 */
char *my_strrchr(const char *s, int c)
{
  const char *p = s + my_strlen(s);
  do
  {
    if (*p == (char)c)
      return (char *)p;
  } while (--p >= s);
  return NULL;
}
#endif

#ifndef __HAVE_ARCH_MY_STRLEN
/**
 * my_strlen - Find the length of a string
 * @s: The string to be sized
 */
size_t my_strlen(const char *s)
{
  const char *sc;

  for (sc = s; *sc != '\0'; ++sc)
    /* nothing */;
  return sc - s;
}
#endif

#ifndef __HAVE_ARCH_MY_STRNLEN
/**
 * my_strnlen - Find the length of a length-limited string
 * @s: The string to be sized
 * @count: The maximum number of bytes to search
 */
size_t my_strnlen(const char *s, size_t count)
{
  const char *sc;

  for (sc = s; count-- && *sc != '\0'; ++sc)
    /* nothing */;
  return sc - s;
}
#endif

#ifndef __HAVE_ARCH_MY_STRSPN
/**
 * my_strspn - Calculate the length of the initial substring of @s which only
 * 	contain letters in @accept
 * @s: The string to be searched
 * @accept: The string to search for
 */
size_t my_strspn(const char *s, const char *accept)
{
  const char *p;
  const char *a;
  size_t count = 0;

  for (p = s; *p != '\0'; ++p)
  {
    for (a = accept; *a != '\0'; ++a)
    {
      if (*p == *a)
        break;
    }
    if (*a == '\0')
      return count;
    ++count;
  }

  return count;
}
#endif

#ifndef __HAVE_ARCH_MY_STRPBRK
/**
 * my_strpbrk - Find the first occurrence of a set of characters
 * @cs: The string to be searched
 * @ct: The characters to search for
 */
char *my_strpbrk(const char *cs, const char *ct)
{
  const char *sc1, *sc2;

  for (sc1 = cs; *sc1 != '\0'; ++sc1)
  {
    for (sc2 = ct; *sc2 != '\0'; ++sc2)
    {
      if (*sc1 == *sc2)
        return (char *)sc1;
    }
  }
  return NULL;
}
#endif

#ifndef __HAVE_ARCH_MY_STRTOK
/**
 * my_strtok - Split a string into tokens
 * @s: The string to be searched
 * @ct: The characters to search for
 *
 * WARNING: my_strtok is deprecated, use my_strsep instead.
 */
char *my_strtok(char *s, const char *ct)
{
  char *sbegin, *send;

  sbegin = s ? s : ___my_strtok;
  if (!sbegin)
  {
    return NULL;
  }
  sbegin += my_strspn(sbegin, ct);
  if (*sbegin == '\0')
  {
    ___my_strtok = NULL;
    return (NULL);
  }
  send = my_strpbrk(sbegin, ct);
  if (send && *send != '\0')
    *send++ = '\0';
  ___my_strtok = send;
  return (sbegin);
}
#endif

#ifndef __HAVE_ARCH_MY_STRSEP
/**
 * my_strsep - Split a string into tokens
 * @s: The string to be searched
 * @ct: The characters to search for
 *
 * my_strsep() updates @s to point after the token, ready for the next call.
 *
 * It returns empty tokens, too, behaving exactly like the libc function
 * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
 * Same semantics, slimmer shape. ;)
 */
char *my_strsep(char **s, const char *ct)
{
  char *sbegin = *s, *end;

  if (sbegin == NULL)
    return NULL;

  end = my_strpbrk(sbegin, ct);
  if (end)
    *end++ = '\0';
  *s = end;

  return sbegin;
}
#endif

#ifndef __HAVE_ARCH_MY_MEMSET
/**
 * my_memset - Fill a region of memory with the given value
 * @s: Pointer to the start of the area.
 * @c: The byte to fill the area with
 * @count: The size of the area.
 *
 * Do not use my_memset() to access IO space, use my_memset_io() instead.
 */
void *my_memset(void *s, int c, size_t count)
{
  char *xs = (char *)s;

  while (count--)
    *xs++ = c;

  return s;
}
#endif

#ifndef __HAVE_ARCH_MY_BCOPY
/**
 * my_bcopy - Copy one area of memory to another
 * @src: Where to copy from
 * @dest: Where to copy to
 * @count: The size of the area.
 *
 * Note that this is the same as my_memcpy(), with the arguments reversed.
 * my_memcpy() is the standard, my_bcopy() is a legacy BSD function.
 *
 * You should not use this function to access IO space, use my_memcpy_toio()
 * or my_memcpy_fromio() instead.
 */
void my_bcopy(const void *src, void *dest, size_t count)
{
  char *destTmp = (char *)dest;
  char *srcTmp = (char *)src;

  while (count--)
    *destTmp++ = *srcTmp++;
}
#endif

#ifndef __HAVE_ARCH_MY_MEMCPY
/**
 * my_memcpy - Copy one area of memory to another
 * @dest: Where to copy to
 * @src: Where to copy from
 * @count: The size of the area.
 *
 * You should not use this function to access IO space, use my_memcpy_toio()
 * or my_memcpy_fromio() instead.
 */
void *my_memcpy(void *dest, const void *src, size_t count)
{
  char *tmp = (char *)dest, *s = (char *)src;

  while (count--)
    *tmp++ = *s++;

  return dest;
}
#endif

#ifndef __HAVE_ARCH_MY_MEMMOVE
/**
 * my_memmove - Copy one area of memory to another
 * @dest: Where to copy to
 * @src: Where to copy from
 * @count: The size of the area.
 *
 * Unlike my_memcpy(), my_memmove() copes with overlapping areas.
 */
void *my_memmove(void *dest, const void *src, size_t count)
{
  char *tmp, *s;

  if (dest <= src)
  {
    tmp = (char *)dest;
    s = (char *)src;
    while (count--)
      *tmp++ = *s++;
  }
  else
  {
    tmp = (char *)dest + count;
    s = (char *)src + count;
    while (count--)
      *--tmp = *--s;
  }

  return dest;
}
#endif

#ifndef __HAVE_ARCH_MY_MEMCMP
/**
 * my_memcmp - Compare two areas of memory
 * @cs: One area of memory
 * @ct: Another area of memory
 * @count: The size of the area.
 */
int my_memcmp(const void *cs, const void *ct, size_t count)
{
  const unsigned char *su1, *su2;
  int res = 0;

  for (su1 = (const unsigned char *)cs, su2 = (const unsigned char *)ct; 0 < count; ++su1, ++su2, count--)
    if ((res = *su1 - *su2) != 0)
      break;
  return res;
}
#endif

#ifndef __HAVE_ARCH_MY_MEMSCAN
/**
 * my_memscan - Find a character in an area of memory.
 * @addr: The memory area
 * @c: The byte to search for
 * @size: The size of the area.
 *
 * returns the address of the first occurrence of @c, or 1 byte past
 * the area if @c is not found
 */
void *my_memscan(void *addr, int c, size_t size)
{
  unsigned char *p = (unsigned char *)addr;

  while (size)
  {
    if (*p == c)
      return (void *)p;
    p++;
    size--;
  }
  return (void *)p;
}
#endif

#ifndef __HAVE_ARCH_MY_STRSTR
/**
 * my_strstr - Find the first substring in a %NUL terminated string
 * @s1: The string to be searched
 * @s2: The string to search for
 */
char *my_strstr(const char *s1, const char *s2)
{
  int l1, l2;

  l2 = my_strlen(s2);
  if (!l2)
    return (char *)s1;
  l1 = my_strlen(s1);
  while (l1 >= l2)
  {
    l1--;
    if (!my_memcmp(s1, s2, l2))
      return (char *)s1;
    s1++;
  }
  return NULL;
}
#endif

#ifndef __HAVE_ARCH_MY_MEMCHR
/**
 * my_memchr - Find a character in an area of memory.
 * @s: The memory area
 * @c: The byte to search for
 * @n: The size of the area.
 *
 * returns the address of the first occurrence of @c, or %NULL
 * if @c is not found
 */
void *my_memchr(const void *s, int c, size_t n)
{
  const unsigned char *p = (const unsigned char *)s;
  while (n-- != 0)
  {
    if ((unsigned char)c == *p++)
    {
      return (void *)(p - 1);
    }
  }
  return NULL;
}

#endif